<template>
    <div>
                 <!-- 面包屑 -->
        <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>用户管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>


        <!-- 卡片区域 -->
        <el-card>
            <!-- 头部警告区域 -->
            <el-alert
        title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>
                选择商品分类：
            <!-- 商品分类的级联 -->
            <el-cascader expand-trigger="hover" v-model="selectedCateKeys" 
            :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
                    </span>
                </el-col>
            </el-row>

            <!-- tab标签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加参数</el-button>

                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                <!-- 展开列 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                            {{item}}
                            </el-tag>
                            <!-- 输入的文本框 -->
                            <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click=showEditDialog(scope.row.attr_id)>编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                <!-- 展开列 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                            {{item}}
                            </el-tag>
                            <!-- 输入的文本框 -->
                            <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click=showEditDialog(scope.row.attr_id)>编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
            </el-dialog>

            <!-- 修改参数的对话框 -->
         <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
            </el-dialog>


    </div>
</template>

<script>
export default {
    data() {
        return {
            catelist:[],
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框双向绑定到的数据
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态属性的数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            addForm:{
                attr_name:''
            },
            addFormRules:{
                attr_name:[{
                    // 必填项验证规则
                        required:true,
                        message:'请输入参数名称',
                        trigger:'blur'
                }]
            },

            // 修改表单
            editDialogVisible:false,
            editForm:{
                attr_name:''
            },
            editFormRules:{
                attr_name:[{
                    // 必填项验证规则
                        required:true,
                        message:'请输入参数名称',
                        trigger:'blur'
                }]
            },
            
        };
    },

    created() {
        this.getCateList()
    },

    methods: {
        // 获取所有的商品分类列表
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败')
            }
            this.catelist = res.data
            console.log(this.catelist);
        },
        // 级联选择框选中项变化，会触发这个函数
         handleChange(){
            this.getParamsData()
        },
        handleTabClick(){
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData(){
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length!=3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 证明选中的是三级分类
            console.log(this.selectedCateKeys)
            const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {
                params:{sel:this.activeName}
            })
            if(res.meta.status !==200){
                return this.$message.error('获取参数列表失败')
            }
            console.log(res.data)
            res.data.forEach(item=>{
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' '):[]
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputValue=''
            })
            console.log(res.data);
            // 判断是否为动态参数
            if(this.activeName ==='many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        // 监听对话框关闭
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        addParams(){
            this.$refs.addFormRef.validate( async valid =>{
                if (!valid) return
                const{data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        async showEditDialog(attr_id){
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{
                    attr_sel:this.activeName
                }
            })
            if(res.meta.status!==200){
                return this.$message.error('获取参数信息失败')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid)
                return
                const{data:res} = await this.$http.put(
                    `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName
                    }
                )
                if(res.meta.status !==200){
                    return this.$message.error("修改参数失败")
                }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 删除
        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err=>err)
        if(confirmResult !='confirm'){
            return this.$message.info('已取消删除')
        }
        const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status !==200){
            return this.$message.error('删除权限失败')
        }
        this.$message.success('删除权限成功')
        this.getParamsData()
        },
        async handleInputConfirm(row){
            // 判断输入的内容是否有效 比如空白字符
            if(row.inputValue.trim().length == 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return 则说明输入的内容需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            //需要发起请求保存到数据库

            this.saveAttrVals()
        },
        // 将对attr_vals的操作 保存到数据库中
        async saveAttrVals(row){
            //需要发起请求保存到数据库

            const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join('')
            })
            if(res.meta.status!==200){
                return this.$message.error('修改参数项失败')
            }
            this.$message.success('修改参数项成功')
        },
        // 点击按钮 展示文本输入框
        showInput(row){
            row.inputVisible = true
            // 让文本框自动获得焦点 nextTick的作用 就是使页面上的元素重新被渲染后 才会指定回调函数中的代码
             this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    // 计算属性
    computed:{
        // 如果按钮需要被禁用 则返回true 否则返回false
        isBtnDisable(){
            if(this.selectedCateKeys.length !==3){
                return true
            }
            return false
        },
        // 当前选中的三级id的分类
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
};
</script>

<style lang="less" scoped>
.cat_opt{
    margin:15px 0
}
.el-tag{
    margin: 5px;
}
.input-new-tag{
    width: 120px;
    margin-left: 5px;
}
.button-new-tag{
    margin-left: 5px;
}
</style>